fix unit testing

[wanliqun]

This change is 

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.56%. Comparing base (9e89dbf) to head (caa6e44).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #69   +/-   ##
=======================================
  Coverage   80.56%   80.56%           
=======================================
  Files          20       20           
  Lines        1307     1307           
=======================================
  Hits         1053     1053           
  Misses        212      212           
  Partials       42       42           

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